sftp hangs when trying to connect to SFTP server

sftp hangs when trying to connect to SFTP server

[Mark Hansen]

Team,

I'm not sure when this started, but I know for sure I was able to do this in the past.

I'm running cygwin on Windows 10 and want to connect to an SFTP server using the 'sftp' command.

Note that when I try to connect to the same SFTP server using a different client, File Zilla, it works.

When I run sftp, it appears to hang. I've run it with -vvvv to get some debugging output and get the following:

1001 jdk16->> sftp -vvvv -P 2100 192.168.160.62
OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data /cygdrive/c/Users/mark.hansen/.ssh/config
debug1: /cygdrive/c/Users/mark.hansen/.ssh/config line 1: Applying options for *
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 46: Applying options for *
debug2: resolve_canonicalize: hostname 192.168.160.62 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts2'
debug3: ssh_connect_direct: entering
debug1: Connecting to 192.168.160.62 [192.168.160.62] port 2100.
debug3: set_sock_tos: set socket 4 IP_TOS 0x48
debug1: Connection established.
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa type 0
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519 type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss type -1
debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: kex_exchange_identification: banner line 0: 220 Welcome to AT FTP service
debug1: kex_exchange_identification: banner line 1: 530 Please login with USER and PASS.

... after some time ...
debug1: kex_exchange_identification: banner line 2: 421 Timeout.
kex_exchange_identification: Connection closed by remote host
Connection closed by 192.168.160.62 port 2100
Connection closed

Here is my local config file (.ssh/config):

Host *
     Protocol 2
     ForwardX11Trusted yes
     ForwardX11 yes

Here is /etc/ssh_config:

Host *
ForwardX11 yes



Yesterday, I upgraded to the latest cygwin packages and now the cygwin DLL is version 3.3.2

I tried running the command with the login user name on the command line (user@192.168.160.62) and
assuming it was just waiting for the password, I tried entering it, but the characters were
just echoed to the terminal and the process continued to hang.

Any idea what is causing this? What can I do to troubleshoot this further?

Re: sftp hangs when trying to connect to SFTP server

[Marco Atzeri]

On 04.12.2021 15:35, Mark Hansen wrote:
> Team,
> 
> I'm not sure when this started, but I know for sure I was able to do 
> this in the past.
> 
> I'm running cygwin on Windows 10 and want to connect to an SFTP server 
> using the 'sftp' command.
> 

Hi Mark,
can you try with 1st entry in:
https://www.sftp.net/public-online-sftp-servers

sftp -P 22 demo@test.rebex.net
(demo@test.rebex.net) Password:
Connected to test.rebex.net.
sftp> ls
aspnet_client  pub            readme.txt
sftp> ls pub
pub/example
sftp> ls pub/example/
pub/example/KeyGenerator.png
pub/example/KeyGeneratorSmall.png
pub/example/ResumableTransfer.png
pub/example/WinFormClient.png
pub/example/WinFormClientSmall.png
pub/example/imap-console-client.png
pub/example/mail-editor.png
pub/example/mail-send-winforms.png
pub/example/mime-explorer.png
pub/example/pocketftp.png
pub/example/pocketftpSmall.png
pub/example/pop3-browser.png
pub/example/pop3-console-client.png
pub/example/readme.txt
pub/example/winceclient.png
pub/example/winceclientSmall.png
sftp> quit


> Any idea what is causing this? What can I do to troubleshoot this further?

please provide as attachment the cygcheck.out

as mentioned on https://cygwin.com/problems.html

Re: sftp hangs when trying to connect to SFTP server

[Andrey Repin]

Greetings, Mark Hansen!

> I'm not sure when this started, but I know for sure I was able to do this in the past.

> I'm running cygwin on Windows 10 and want to connect to an SFTP server using the 'sftp' command.

> Note that when I try to connect to the same SFTP server using a different client, File Zilla, it works.

It seems you are connection to an FTP(S) server, not SSH(SFTP) server.

> When I run sftp, it appears to hang. I've run it with -vvvv to get some
> debugging output and get the following:

> 1001 jdk16->> sftp -vvvv -P 2100 192.168.160.62
> OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
> debug1: Reading configuration data /cygdrive/c/Users/mark.hansen/.ssh/config
> debug1: /cygdrive/c/Users/mark.hansen/.ssh/config line 1: Applying options for *
> debug1: Reading configuration data /etc/ssh_config
> debug1: /etc/ssh_config line 46: Applying options for *
> debug2: resolve_canonicalize: hostname 192.168.160.62 is address
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' ->
> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts'
> debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' ->
> '/cygdrive/c/Users/mark.hansen/.ssh/known_hosts2'
> debug3: ssh_connect_direct: entering
> debug1: Connecting to 192.168.160.62 [192.168.160.62] port 2100.
> debug3: set_sock_tos: set socket 4 IP_TOS 0x48
> debug1: Connection established.
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa type 0
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_rsa-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_dsa-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ecdsa_sk-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519 type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_ed25519_sk-cert type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss type -1
> debug1: identity file /cygdrive/c/Users/mark.hansen/.ssh/id_xmss-cert type -1
> debug1: Local version string SSH-2.0-OpenSSH_8.8
> debug1: kex_exchange_identification: banner line 0: 220 Welcome to AT FTP service
> debug1: kex_exchange_identification: banner line 1: 530 Please login with USER and PASS.

> ... after some time ...
> debug1: kex_exchange_identification: banner line 2: 421 Timeout.
> kex_exchange_identification: Connection closed by remote host
> Connection closed by 192.168.160.62 port 2100
> Connection closed

> Here is my local config file (.ssh/config):

> Host *
>      Protocol 2
>      ForwardX11Trusted yes
>      ForwardX11 yes

> Here is /etc/ssh_config:

> Host *
> ForwardX11 yes



> Yesterday, I upgraded to the latest cygwin packages and now the cygwin DLL is version 3.3.2

> I tried running the command with the login user name on the command line (user@192.168.160.62) and
> assuming it was just waiting for the password, I tried entering it, but the characters were
> just echoed to the terminal and the process continued to hang.

> Any idea what is causing this? What can I do to troubleshoot this further?

See above, connect to an actual SSH server.


-- 
With best regards,
Andrey Repin
Saturday, December 4, 2021 18:26:06

Sorry for my terrible english...

Re: sftp hangs when trying to connect to SFTP server

[Mark Hansen]

On 12/4/2021 7:30 AM, Andrey Repin wrote:
> Greetings, Mark Hansen!
> 
>> I'm not sure when this started, but I know for sure I was able to do this in the past.
> 
>> I'm running cygwin on Windows 10 and want to connect to an SFTP server using the 'sftp' command.
> 
>> Note that when I try to connect to the same SFTP server using a different client, File Zilla, it works.
> 
> It seems you are connection to an FTP(S) server, not SSH(SFTP) server.

Yes, it seems. I wonder how this was working before. I have notes showing that I've always
connected using 'sftp'. Anyway, I'm able to connect using 'ftp' so I think the issue
is resolved.

Thanks,